64410221 has 4 divisors (see below), whose sum is σ = 65981244. Its totient is φ = 62839200.

The previous prime is 64410217. The next prime is 64410223. The reversal of 64410221 is 12201446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12201446 = 2 ⋅6100723.

It can be written as a sum of positive squares in 2 ways, for example, as 26894596 + 37515625 = 5186^2 + 6125^2 .

It is a cyclic number.

It is not a de Polignac number, because 64410221 - 2² = 64410217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64410193 and 64410202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64410223) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785450 + ... + 785531.

It is an arithmetic number, because the mean of its divisors is an integer number (16495311).

Almost surely, 2^64410221 is an apocalyptic number.

It is an amenable number.

64410221 is a deficient number, since it is larger than the sum of its proper divisors (1571023).

64410221 is a wasteful number, since it uses less digits than its factorization.

64410221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1571022.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 64410221 is about 8025.5978593498. The cubic root of 64410221 is about 400.8528075892.

Adding to 64410221 its reverse (12201446), we get a palindrome (76611667).

The spelling of 64410221 in words is "sixty-four million, four hundred ten thousand, two hundred twenty-one".